Here is a list of at least 13 drugs that can contribute to weight gain, despite your best efforts.

Popular drugs such as Allegra, birth control pills and insulin contribute to weight gain, however, are crucial to the health and well being of many.

“Patients and doctors need to be more aware of this—it’s an under-recognized driver of our obesity problem,” says Lawrence Cheskin, MD, director of the Johns Hopkins Weight Management Center, in Baltimore.

Prescription drug use can be no less harmful than illicit drugs.

Although millions of people are treated successfully with prescription medication there are those whom are unable to follow doctor’s orders to safely treat their illnesses.

As much attention as we pay to illicit drugs such as cocaine or heroin, the truth is prescription medications kill more people in this country than those illicit drugs combined. Perhaps it is a perception issue: “It came from a pharmacy, therefore, it must be safe.”